Louis de Broglie (Nobel Prize in Physics 1929)

Louis de Broglie was a French physicist who, in 1924, proposed that particles like electrons also exhibit wave-like properties, similar to light. This idea, called wave-particle duality, helped unify our understanding of quantum behavior. His groundbreaking work earned him the Nobel Prize in Physics in 1929. Essentially, de Broglie showed that matter can behave both as particles and waves, challenging classical physics and laying the foundation for modern quantum mechanics, which describes the behavior of very small particles in the universe.